EntityQ2552709· pop 9· linked from 131 articlespoint sourceSign in to savesingle identifiable localised source of somethingConnectionsanisotropyEntityEarthConceptphysicsEntityastronomyEntitystarEntitylightEntitysoundEntitytornadoEntityairportEntityatmosphere of EarthEntityvacuumEntityX-rayEntitypressureEntitydistanceEntitypointEntitywavelengthEntityair pollutionEntitygamma rayEntityradiationEntityacousticsEntityCategoriesExperimental physicsMathematical physicsPoint (geometry)